We have a lot of smaller and larger Perl-scripts and applications. In the course of time, new functionality is added and old code gets refactored or removed. Often people forget to remove imported modules when they are no longer needed, partly because it can be hard to see if a module is actually used. This adds a lot of unnecessary dependencies to the software.

How do you guys check which imports are actually needed? Most of the times I find myself searching through the code for occurrences of the module, while checking CPAN to see which symbols are automatically imported. This however is a very cumbersome method, and prone to error.